package com.xia.gulimall.product.service.impl;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.xia.common.utils.PageUtils;
import com.xia.common.utils.Query;

import com.xia.gulimall.product.dao.CategoryDao;
import com.xia.gulimall.product.entity.CategoryEntity;
import com.xia.gulimall.product.service.CategoryService;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {
    @Autowired
    CategoryDao categoryDao;

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );


        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {
        //1.查出所有分类
        List<CategoryEntity> entities = baseMapper.selectList(null);
        //2.组装成父子树形结构
        // 2.1 找到所有的一级分类 一级分类的父分类Id为0
        List<CategoryEntity> level1 = entities.stream().filter(categoryEntity -> categoryEntity.getParentCid() == 0)
                .map(categoryEntity -> {
                    categoryEntity.setChildren(getChildrens(categoryEntity, entities));
                    return categoryEntity;
                })
                .sorted((men1, men2) -> {
                    return (men1.getSort()==null?0:men1.getSort()) -( men2.getSort()==null?0:men2.getSort());
                })
                .collect(Collectors.toList());
        //5 55 6.05 6.7 7.34 8 8.8 9.6 10.5
        return level1;
    }

    @Override
    public void removeMenuByIds(List<Long> asList) {
        //TODO 检查当前要删除的菜单是否被其他地方引用
        //逻辑删除
        baseMapper.deleteBatchIds(asList);

    }

    //递归查找所有菜单的子菜单
    private List<CategoryEntity> getChildrens(CategoryEntity root, List<CategoryEntity> all) {
        List<CategoryEntity> childrens = all.stream().filter(categoryEntity -> {
            return categoryEntity.getParentCid() == root.getCatId();
        }).map(categoryEntity -> {
            categoryEntity.setChildren(getChildrens(categoryEntity, all));
            return categoryEntity;
        }).sorted((men1, men2) -> {
            return (men1.getSort()==null?0:men1.getSort()) -( men2.getSort()==null?0:men2.getSort());

        }).collect(Collectors.toList());
        return childrens ;
    }

}